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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ac4aa2328becdd11ad20d5696525e8849011d9a25b332f463a9c43cd289c70' 
  AND token = 'ERjNVXidTmpa4ifiHvHabptnIuNoOccJSzvb0wVYbsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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