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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f814eac1002e5a94282ee119bce38122ae9c2031eed965b51e35320d2021ce' 
  AND token = 'jWyKoeAHHhsmqgwp1j+I/LBJgGda8XoDrTNPV7HcRQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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