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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c522a4e474b708efa64d0420e90fc4ec4f1d42061c291633092af92bb27e98' 
  AND token = 'fptoQ/zWXY8KLt05hKLVXOOfj4nFgKiyN1VgmsPxCGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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