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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88a75fd7aaf1aa9484e9f8debf542a66f478853747eca8a5087fba5d2f69ba8' 
  AND token = '/AkFIXTb99Yrwe3G2KKS/CuUTdqD4eH/8L8TmUSOBY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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