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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8e70eab4cdae00643efed1b60c0c7113fb28556dade6d83bc44a3d15fcedcd' 
  AND token = 'lNJat/J5RMpc38U9Y+sH0i/RrmMX1qmmT5Ix5Wf78mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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