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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde1bee86bec451e1b9ccb44f5d1e6c1ffa8a0c5e85bae88be75b33c51b43776' 
  AND token = 'WNDRc4F5C3gRbdLSyuMWs2oaq8v045QLJQy0QefJXCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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