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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6be2d593ae2a740e6bbf6001a96aa0b1c65d54cfb0662f9462dc52b6702ae28' 
  AND token = 'I1MYG5KlJReFYs139FSTyflwUPt1ClAr6JntoSXO5IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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