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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6538c36cc62d85076a7d679ec71cfbb8961c628bd7fbd95f2fc3671d02359f23' 
  AND token = 'NO25L5yGkvfOqB5npJiv47rtNcCoDy09TtVFeVFImWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}