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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddeb7086a4f6ff4b154f2ed36073437d770e137cb7cf874863d025b69dbb1238' 
  AND token = 'pnVUCHGfHeW80BroseH7TX38bDYKVyVENVzID7PKx28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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