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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6851df6e9f001a58c58afd1459234af434f7ccdcc0ce2d4b22363225c5e3bb39' 
  AND token = 'dtb+UMMf5lsF5VHq/YWG7ybK1N9WiZZ6Bbp1DKMSDCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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