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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbc4534d00ec9e6006b271971507aa231a56f86a6a7090c3fcca02557816390' 
  AND token = 'UMDzGO5v/X/fsIK702Ij7sOgzt9ToNl+3dqLEVA36rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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