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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb1ca8915075a0504c16268fe34c7c345e1beb74df5eb06c19371dd5c1517a7' 
  AND token = 'Enf5M/ICTyG8k48xjfJCPjQC9i9/CC4/pXcRvqYD0k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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