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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25b6da72c8152959ca6012af26e84090319ced5ae3f4716a95bdcfe5b8934ed' 
  AND token = '8tscOkSSoHv6KFER7zP9nLo8QU/ZWaZzG10A8affVTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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