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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263fff755bf675637b1f47c9b5201f98c55b265a59a00c9f3407f84fdf12510f' 
  AND token = 'Zl5fD1LqNj6q6Ty8SSCkiZPsUXIT8YSNKr+Wt2vpw8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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