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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e9f2b05f3deba7d8dbd8db193686fd7da9a17a66eee4792c409f5f6109b301' 
  AND token = 'D780gDmUnJh+D9BrlVF/7cd1illSvlI69lKbAMjROUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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