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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97377566fc9ce4d0fa688bc0525a750a439da4cf03b200808eaf1ded9453aa86' 
  AND token = 'nF/ek7ZkBNV3a/pQ62W7lpfQuw2wAP6wDjIcAWO9FFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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