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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33605c670544f7e500b8309d64b6f5c4127042b240abfad9c6e57ab6e2780fa' 
  AND token = 'y8mZM94Hqw5qC0RruqJLo/0uILK7L8/CHQ/MwqIDrd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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