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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801ff9ae4fb0598bb69cfa4047e0f049074402315ea78f8fb6a248fccb9573dd' 
  AND token = 'pN7PR20YnpnKI12hNo2WwUpRNgxLAcIbPpkv6U6OP2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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