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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c4400570ba6d20c2330790e4e7a71fc5a4f0c0d163864218aadf3a93594a26' 
  AND token = 'SjCo0q5F8UPQEn/Q9fENBOOdz35SM7acx9+apYIsSF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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