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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94acf418c3c86ed7da2d81398c77653e6524eab014020cac47409af479323603' 
  AND token = 'o5/REJIhnLDKB6ajBgSyOUfnEzp1G5RR6gYaI4txnIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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