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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077a8aef49054b02cb487a5161033b4765195d495eecc8c500e4cf70c3a6eff8' 
  AND token = 'gWF5PmHuoyfivUwuJOJ8pSnjvQxriMzTEnVDr1yEeJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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