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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f62faf91c5c64d7b00f7848d9fae72ebd43408554d1ea4a4b9791a64da54b4' 
  AND token = '6TBVL9yPmjBlK8KBX8DGT/8CA8jz5LPsdRFITtLVrHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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