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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc11192504a65ba9678771c6639699b13a52cdcdbebf0ac54ba48de0bb3fbe9' 
  AND token = 'q2Tv9snxoOMcyU8Um4oc7ySrtyqZZ/GLlYRLLJYiTtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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