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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175c026a74f8b5a433c8692993c2a5f731e2be9766dfa955420d5b7f517c792d' 
  AND token = 'fTZ7vpKreiFxtxnUp+ZuYL+Od0Y4dw513KbvJyQ9wkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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