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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d29397ea6bebc93bc5e85b6f377c6d7393ffcde02cccc8c8f8fcf0202e692d3' 
  AND token = 'PVQmf1Zglou7Qo/g7HEmLu6mXZaluK+vdWfXJeS6lLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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