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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c239ad2b4dddf53553e9e5db9bb9d4115451b25d56155bbb24bc21f56f6e6eb' 
  AND token = 'tGa/bQ5j5ECkjHxu/+1LZFMbsqyHwfIH0MyJVUmKY5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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