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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59ed875d70d4b8ddd8def2e08823d5502df03bbd9cb6d2e60ad0b0c13eb0f7c' 
  AND token = 'MwfYY4NbTCqN0qY9nRfhE/EQhOwhyLqy9aTQFxZqJmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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