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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0c7859c2ab2bf185061ed20964127a75612cc4f77277f9d9881da7e09a7b1d' 
  AND token = 'V2a/ffcmy1etZO66QakNHrfEl+gLS/fv9sVzddIlkGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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