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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd2867b52b10e906facba57270478cc1338fa46cbc9ea3533297f161359d077' 
  AND token = 'OUvJsnP9Zz745sxRteeIrH7m21zdyhsikfn3pgumijA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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