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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42775d9430654c35e44dbd2f18a5c3be69523e2e965e7bb542066242f68ee9a' 
  AND token = 'k92KSd8TG1Tp58gsixSsBjIfjwThmzRzLa9nQzyrBvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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