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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a438f2a22bcd7bbad5feea8be6db0d9b3d5f7f3f5d6f115e0a85754008a4e9' 
  AND token = 'PRtDtUhBmHPa/z6ugj9ZpZQicSz09r1FHZrXs/9IDHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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