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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d020759a8b9c1a8c085b99d73149c4b84fa9f00ee5e6dc9b76861aaf2b8db1a' 
  AND token = '+Q0ILd7gyfj4e5cvvS8QbSqUndMEK8uSSTp8AAvrBqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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