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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d155d84b6b7e1c37e307716ef83f1b174e3d493e025986d4daeb2bfe987c10' 
  AND token = 'lHkb/6CzpJeA8vKDZiRlmMpLFDL1s+WR5kmesHlzlZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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