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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191f87929922bc817ea3bc25f52c164bebcb811687fa4702778f1a01407379c4' 
  AND token = '+d/8dy7uLQwFCfHM6l8zu4xnscKLJpAu2Q3+ftFhPA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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