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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f63a97acd71b17632471d1ec390ed017ea0bd5427709eebb00930ca0fd80bba' 
  AND token = 'HjGuwcaaT8ZpK+qa08nl7Cc3Kr6JRk0ceK9iV6nhGis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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