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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccaa02bcd13f7122a6d73f1cc012b2982ed13242079d3a910eda5367a469b8d' 
  AND token = 'uYNyb0eZmpA9z/C0w0FKvObwIUeYXv0UE6KbtQKMO/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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