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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52adee37354bbd05b9a08ae7054d8ba455b97d8ff7b04a2837c3fd3564a80859' 
  AND token = 'q7COf15SeeWjj4PAAC353Ay5vqWZ5kU7tRSn11JM1Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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