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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebe41c1df63ebc652381fbbbade76290c6803dda20f738c6fce53836a1f1e2d' 
  AND token = 'jRSd6GQill5Wro6aNX5O9/gL60ipp8iLqMxdRLVl6Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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