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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa89b285bcc7c425d2f4d7451d936839660d80524106e76b5ccdb1997bf4696' 
  AND token = 'a3ulgRmG8W59RMCWbYbEzz2uuXp6+bXOEZ98dcu0hyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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