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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba8af3db8d6859fac073537f4f12ce45c7696e1f8dfd4ff70121d3f0a887289' 
  AND token = 'DlcbYNAs0lpqp410VzeG5jTfyxp21tVFanb+MPXvp8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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