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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9de7b0f5e8174587a475e0a17b83690e59b228c03fc4bf1a0f3c11049cf47a7' 
  AND token = 'MZZ3MlDYlO37a6n8ElTsTb5Q7RFUOF9M+R81f9JwWa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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