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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b57594b41801706c8ae0b5f1465d5a27892752d739fdfbe66c2ec488005f2fb' 
  AND token = 'yJKwJum/rDmbXkwb9Me2lbN/t7/pQcp5zhdGy4WumBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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