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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e05b41507d742824e3026d946570a76986072436c5b606864338291fe30939' 
  AND token = 'q7OO8TASK+0gUHQ5HOKB+cqqeVNndSo/bcoMupOd1S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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