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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4d1e9b6e8867c530af7bb49c35311537ac8299d0d1739adcaa520811c2f6f9' 
  AND token = 'Wok7f6Fo9Lwjz1UWI6GUpBBKf3Dpr54G/TIO6ydYvEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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