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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031137110fc8a4c5b48fe45d6622b62f2e1ec8eec5e46a94a505bcb91becfda7' 
  AND token = 'Wn7Bo3h4QsYfsqBVFnOdTaWipEAS7ZFKLoFypQXh+d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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