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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b726d70554fafc014d04c6fb5e8b837b4ab26a7ff1f23ef0be3067abc2650d9' 
  AND token = '33N3lhaJ5bacRobW6JCuy2Nn5zbZxoMl3j9/m00tpn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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