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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63381e63cd5b0ca1ef4b55dc66cbf731b8d18ccfaf325cbd1af7c84af37565c' 
  AND token = 'qbvk7QgPHLheo++nc5JebKsaKJTPo+cN8b6bECXy6uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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