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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472e3cda9433f4fe27a2a7b0232d1f33da4037c249b9e15c66ba3a4003521d11' 
  AND token = 'Wo2fhx3wJToiAVsY7GiKkJXtMp93McSf9WkV8M2cR68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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