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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5b513396385d2d25396d05b8cf282e6592ef719366f78c4fd0359b99a83ac8' 
  AND token = 'hJv02VF/yB7PSACNahQTj7sP3ozFU2wTPze64e5s9os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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