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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfbf11fe09441080e29159a29ad0fde42e0f1d7123c506e704f165bc5d212de' 
  AND token = 'GsMrTmXlDCgy5IgzTnj91p4YwWO/n1F/Ycj27CL0p7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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