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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f17ff138a1c33c5457dba905a845838efb956683569c073c8382b7d44457d05' 
  AND token = 'DHH7yLUq5HuzM9+C4dWJ+4f2tQsrPtYlSMa/D/NERes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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