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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da6ad89b7e50cf716106126ab748a8949d1f1008d3f5216b289c71c8526116a' 
  AND token = 'TIf432K8Ol4eM1WU3CwF733g7STo3+1cHsu/3sUku8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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