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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd2aaa6b68cf28d6acc1349c5fa9523b02e172301632226bf4710583f2f5bb0' 
  AND token = 'lPnvumAehpp0c69JfAt81ixmDumX3QRBYFDK4SZukEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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