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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639c17a26734b46684c4e0ac146e295ba1250343156ccb7fb07d53c189ed0d0a' 
  AND token = 'UnuUhBfk6m5fNR6PXaydfw9FZNmPuYwn9i5hKhC/WyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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