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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5670cd52854320a483ac4c638e73aa03e26ed601e3450c42309e0fcd3a4b4c2' 
  AND token = 'Fex4iHIJ3y07kG9W41WjylBDWTEn7lSlI1tdo/7mdgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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