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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc0c6eb15597aa3785fbfd00be3bf12e045f6a82b042aa13413216dc3473994' 
  AND token = 'cJhAyV16eUJlExUGNyKoDA6Ad8rM61OAN+sR/IyhhP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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