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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee206557137acb1ebb814b527f1a77b838faf0b5c276d2b9b711ee18d4cd1288' 
  AND token = '2ts1KzYvUCx9Oj68uhzmMS66orEdjXHpxuWwni422ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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