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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4685e7d4e7229f19b09b3b1494bc2004f4b3373c2cef0d472b5223a5aa769314' 
  AND token = 'OPzysHXKuUyX8yKAEFPBjkE8KOvUDixASvn23Vc9EHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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